Design for 3D-Printing

This is neat! What’s the angle you can do before you need supports?

What amount of bridging is ok?

It actually is fairly filament dependent (among other things)

For example, stiffer filaments can usually handle more overhang before they sag and screw things up.

The easiest rule of thumb is to assume 45degrees, which works for ~all filaments.

You can do a lot better if you choose filaments right however.